Pearl-button chuck.



P. F. DUSHA & A. FEYK.

PEARL BUTTON CHUCK.

APPLICATION FILED AUG. H. 915- Patented May 9,1916.

TTE TAT PATENT PAUL F. DUSHA AND ANTON FEYK, OF NEW YORK, N. Y., ASSIGNORS TO HOLUB DUSEA COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

PEARL-BUTTON CHUCK.

Specification of Letters Patent.

Patented May 9, ifild.

App1ication fiIed August 11, 1915. Serial No. 44,886.

To all whom it may concern:

Be it known that we, PAUL F. DUSHA and ANTON FEYK, citizens of the United States, and residents of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Pearl-Button Chuck, of which the following is a full, clear, and exact description.

This invention relates to a work holder in the form of a chuck adapted to hold a pearl or other button having an integral shank in which is to be drilled a thread passage or opening extending diametrically of the shank. It is difiicult to drill self shank buttons of this type with a thread hole parallel with the position of the button without a great percentage of breakage. This is due to the fact that the shell which forms the stock from which the buttons are made grows in layers, and the jarring, vibration and feed pressure of the drill causes cleavage of the layers or breaking off of the shank.

It is the general object of this invention to provide a chuck which holds the button in such a manner that the shank can be diametrically drilled without danger of cleavage of the button shank, the chuck being so designed as to tightly grip the front and back of the button with considerable pressure.

A more specific object of the invention is the provision of a button-holding chuck having spring jaws which are opened and closed by relative longitudinal movement of the jaws and body or shell of the chuck, one jaw being provided with a novel centering device whereby the shank of the button gripped by the jaws will be centralized automatically with respect to the drill by which the thread opening or passage is bored.

With such objects in view, and others which will appear as the description proceeds, the invention comprises various novel features of construction and arrangement of parts which will be set forth with particularity in the following description and claims appended hereto.

In the accompanying drawing, which illustrates one embodiment of the invention and wherein similar characters of reference indicate corresponding parts in all the views, Figure 1 is a longitudinal section of the chuck, showing a button clamped therein and the shank of the button drilled; Fig. 2 is a longitudinal section of the jaw element of the chuck so as to show the position of the button centering device, the section being taken on the line 2-2, Fig. 3; Fig. 3

is an end view of the jaw element of the chuck with a button in position; and Fig. at is a perspective View of a drilled button.

The present invention is designed especially for drilling buttons or equivalent articles of the form shown in Fig. 4, wherein 1 is the body of the button, which has a stud-like central shank 2 projecting from its back, and this shank is pierced by a diametrical thread-receiving opening 3 which is parallel with the plane of the body of the button. 7

In Fig. 1 A designates the button chuck and B the drill chuck, the latter being of any desired construction and is adapted to hold a drill 4 by which the passage 3 in the button C is drilled. The chuck A comprises a shell or casing 5 in which is longitudinally slidable a jaw element 6 that is split longitudinally throughout part of its length so as to form separate jaws 7 and 8 which are compressible toward and from each other and which spring apart by the resiliency of the split shank 9 of the element 6. In the bore 10 of the casing 5 is a helical spring 11 which has one end bearing on a shoulder 12 carried by the aw element 6, and the other end bearing against an internal shoulder 13 formed by the bore 10 of the casing being reduced. This spring exerts a pressure on the jaw element in a direction tending to pull the same inwardly, and by so doing the jaws are adapted to be closed, this closing being due to the fact that the casing has a hollow conical seat 14 at the outer end of its bore, and the jaws 7 and 8 are tapered at 15 to engage the seat, whereby a wedging action is produced as the spring 11 draws the jaw element inwardly. Any suitable means may be connected with the jaw element for moving same axially against the tension of the spring 11, so that the tapered surfaces 15 of the jaws will disengage the conical seat 14, whereby the jaws can spread apart and release the button 0. The jaws have opposed gripping surfaces 16 and 17 which are adapted to engage respectively the front face of the button C and the shank jaws are open by the jaw element 6 being ized with respect to the drill 4, and for this purpose the jaw 8 has applied to its gripping face 17 a centering plate 18 secured in any suitable manner, as, for instance, by screws 19. The front edge of this plate is provided with a V-shaped recess 20, the vertex 21 of the recess being coincident with the axis of the chuck and of the drill, whereby it is possible for the button to occupy but one position, so that when the drill is fed through the shank of the button, the opening drilled thereby will be in a diametrical plane. By means of this centering plate the buttons can be placed properly in the chuckin a very expeditious manner.

It will be noted that the jaws grip the front and back of the button with considerable pressure, which is desirable, since it overcomes any tendency of the drill causing the shank to split. \Vithout gripping the button in this manner the drilling of a diametrical hole in the shank parallel with the face of the button results in considerable loss due to breakage of the shank, as the shell stock is formed in layers which split apart unless the button is clamped in the manner set forth.

From the foregoing description taken in connection with the accompanying drawing, the advantages of the construction and method of operation will be readily understood by those skilled in the art to which the invention appertains, and while we have described the principle of operation, together with the device which we now consider to be the best embodiment thereof, we desire to have'it understood that the device shown is merely illustrative and that such changes may be made when desired as fall within the scope of the appended claims.

Having thus described our invention, we claim as new and desire to secure by Letters Patent:

1. A button-holding chuck comprising a hollow surrounding member, a jaw member movable longitudinally therein and having an approximately diametrical slit to form oppositely disposed spring jaws, said members having coacting surfaces for forcing the jaws toward each other, the opposed faces of the jaws being shaped to grip the top face of the head of a button and the bottom face of the button shank, whereby the button is clamped by a pressure applied axially thereof, and means carried wholly by one jaw and having a transverse button shank receiving recess for centering the button in a position with the axis of the shank intersected by the axis of rotation of the chuck.

2. A chuck for gripping shank buttons, comprising a tubular chuck body, and spaced jaws movable longitudinally of the body for opening and closing the jaws, said jaws having opposed faces for gripping the top and bottom surfaces of the head and shank of a button, one of the jaws having a transverse V-shaped recess which converges inwardly in a plane parallel with the axis of the chuck, whereby the walls of the recess engage the side of the button shank to center the button.

3. A chuck for holding a shank button for drilling the shank diametrically and parallel with the plane of the head of the button, said chuck comprising a casing, a jaw element having a pair of jaws tending to spring apart, means acting on the jaw element to move the same longitudinally, coacting surfaces on the jaw element and casing for closing the jaws by the action of the said means, the jaw elements having opposed surfaces for gripping respectively the head and shank of a button, and a plate fastened to the gripping face of one of the jaws and having a substantially V-shaped recess for receiving the shank of the button for centering and holding the shank with its axis transecting the axis of the chuck.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

PAUL F. DUSI-IA. ANTON FEYK.

Witnesses ADoLPH TVRDY, ZDENEK PoPPE.

Gopies 0.1 this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

